package FourArithmeticOperations;

import java.util.LinkedList;

/**
 * Created by dell on 2017/9/25.
 */
public class Linked extends LinkedList {
    public Linked() {
        super();
    }

    @Override
    public Object removeFirst() {
        return super.removeFirst();
    }

    public boolean addFirst() {
        return true;
    }

    @Override
    public boolean contains(Object o) {
        return super.contains(o);
    }
}
